Trane trg-trc001-en Air Conditioner User Manual


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TRG-TRC001-EN 39
period five
Tons of Refrigeration
notes
Realize that 4.5 is not a constant! It is the product of density of air and the
conversion factor of 60 minutes per hour. The density of air at “standard”
conditions (69.5°F DB dry air at sea level) results in the value 4.5. Air at other
conditions and elevations will cause this factor to change.
Using the supply airflow calculated during Period 4 and the enthalpy values
read from the psychrometric chart:
Converting to the more common units of tons:
Density 0.075 lb/ft
3
=
0.075 60 min/hr× 4.5=
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Figure 64
Refrigeration Load (Btu/hr 4.5 3,430 cfm× 32.7 23.5–()× 142,000 Btu/hr==
142,000 Btu/hr
12,000 Btu/hr/ton
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11.8 tons of refrigeration=
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